windows phone 8 - How to discard old toast notifications without closing push channel? -

according msdn, mpns put notification requests in queue delivery, there time delay them device. problem that, sometimes, example when device goes temp disconnected mode, time delay long toast notifications become outdated when arrive. there way discard/ignore these old toast notifications without renew current push channel? if not, right me renew push channel every time open app?

as far know, it's ok renew channel every time open app. if app not running , don't have background task getting these notifications, automatically discarding them anyway. also, if memory serves me correctly, should use channel request object has been used receive stuff channel, can same channel (i might wrong here). in case, if old messages, have handle local discarding manually.